While an increasing number of aging indie musicians have made the dubious decision to enter the “music for kids” game in recent years, Japanese duo Lullatone has been assembling precious lullabies since 2002. Songs That Spin in Circles is the couple’s sixth album, albeit the first since the recent birth of their son. As always, the music is a sleepy collection of bells, chimes, and pleasantly plucked notes. Unquestionably serene, the music is nonetheless at its best when accentuated with listing vocal snippets that practically double as white noise (“A Mobile Over Your Head,” “A Merry-Go-Round in the Park”). The bossa nova guitar and gently hip-shaking percussion of “A Plastic Bag in the Wind” is another welcome diversion.